JPS5589821A - Malfunction preventing circuit of camera - Google Patents

Malfunction preventing circuit of camera

Info

Publication number
JPS5589821A
JPS5589821A JP16116278A JP16116278A JPS5589821A JP S5589821 A JPS5589821 A JP S5589821A JP 16116278 A JP16116278 A JP 16116278A JP 16116278 A JP16116278 A JP 16116278A JP S5589821 A JPS5589821 A JP S5589821A
Authority
JP
Japan
Prior art keywords
comparator
release signal
electromagnetic release
photographing
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16116278A
Other languages
Japanese (ja)
Inventor
Akita Namioka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Precision Corp
Original Assignee
Nidec Copal Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nidec Copal Corp filed Critical Nidec Copal Corp
Priority to JP16116278A priority Critical patent/JPS5589821A/en
Publication of JPS5589821A publication Critical patent/JPS5589821A/en
Pending legal-status Critical Current

Links

Landscapes

  • Focusing (AREA)
  • Stroboscope Apparatuses (AREA)
  • Indication In Cameras, And Counting Of Exposures (AREA)
  • Automatic Focus Adjustment (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To prevent malfunction exposure by regenerating the electromagnetic release signal annihilated by the leading edge only at the photographing suited state.
CONSTITUTION: When the output of a comparator 8 inverts to a high level along with shutter operation, a capacitor 14 i charged during the time constant period by a capacitor 14 and resistance 13 by way of inverters 10, 12, during which time a comparator 15 generates the electromagnetic release signal of a high level. An SCR20 then conducts and an FF19 is set by the negative differentiated output from the differentiating circuit formed by a capacitor and resistance, by which the comparator 8 is inhibited and the electromagnetic release signal annihilates at the leading edge. On the other hand, when the terminal voltage of a battery 1 is above the specified and is in a photographing suited state, the high level signal from a voltage judgement circuit 25 resets the FF19 through the AND gate 26 which opens at the setting of the FF19, thereby releasing the inhibition of the comparator 8. At the same time, the FF19 assumes the state where it is not reset, thus the exposure control free from malfunction is accomplished by the electromagnetic release signal which outputs again only at the photographing suited time.
COPYRIGHT: (C)1980,JPO&Japio
JP16116278A 1978-12-28 1978-12-28 Malfunction preventing circuit of camera Pending JPS5589821A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16116278A JPS5589821A (en) 1978-12-28 1978-12-28 Malfunction preventing circuit of camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16116278A JPS5589821A (en) 1978-12-28 1978-12-28 Malfunction preventing circuit of camera

Publications (1)

Publication Number Publication Date
JPS5589821A true JPS5589821A (en) 1980-07-07

Family

ID=15729765

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16116278A Pending JPS5589821A (en) 1978-12-28 1978-12-28 Malfunction preventing circuit of camera

Country Status (1)

Country Link
JP (1) JPS5589821A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059325A (en) * 1983-09-12 1985-04-05 Fuji Photo Optical Co Ltd Detecting circuit for strobe charging voltage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49115323A (en) * 1973-03-05 1974-11-05

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49115323A (en) * 1973-03-05 1974-11-05

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059325A (en) * 1983-09-12 1985-04-05 Fuji Photo Optical Co Ltd Detecting circuit for strobe charging voltage

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